Dual Step-Down Power-Supply (SMPS) Controller using MAX17031

This is very simple electronic circuit project of dual step-down power-supply (smps) controller circuit using the MAX17031. Dual step-down power-supply (SMPS) controller can be designed a very simple high efficiency power supply circuit with synchronous rectification, intended for main 5V/3.3V power generation in battery-powered systems.

Dual Step-Down Power-Supply (SMPS) Controller Circuit Diagram:

Power-Supply Controller Circuit Diagram

Low-side MOSFET sensing provides a simple low-cost, highly efficient current sense for valley current-limit protection. Combined with the output overvoltage and undervoltage protection features, this current limit ensures robust output supplies.

The device includes independent shutdown controls with well-defined logic thresholds to simplify power-up and power-down sequencing. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target over a 1ms period.

The Max17031 can be used in applications like : Notebook Computers , Ultra-Mobile PC , Main System Supply (5V and 3.3V Supplies), 2 to 4 Li+ Cells Battery-Powered Devices , Telecommunication

Main features of Max 17031 are : Dual Quick-PWM , Preset 5V and 3.3V Outputs , Internal 100mA, 5V Linear Regulator , Internal OUT1 LDO5 Bypass Switch , Secondary Feedback (SKIP Input) Maintains Charge Pump , 3.3V, 5mA Real-Time Clock (RTC) Power (Always On) , 2V ±1% 50μA Reference , 6V to 24V Input Range , Pulse-Skipping/Forced-PWM/Ultrasonic Mode Control , Independent SMPS and LDO5 Enable Controls , Combined SMPS PGOOD Outputs , Minimal Component Count.

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